Arguments

 

start_va_64

   OpenVMS usage:address
   type:         quadword address
   access:       read only
   mechanism:    by value
   The starting virtual address of the range of pages whose
   protection is to be changed. The specified virtual address will
   be rounded down to a CPU-specific boundary.
 

length_64

   OpenVMS usage:byte count
   type:         quadword (unsigned)
   access:       read only
   mechanism:    by value
   Length of the virtual address space whose protection is to
   be changed. The specified length will be rounded up to a CPU-
   specific page boundary so that it includes all CPU-specific pages
   in the requested range.
 

acmode

   OpenVMS usage:access_mode
   type:         longword (unsigned)
   access:       read only
   mechanism:    by value
   Access mode associated with the call to $SETPRT_64. The acmode
   argument is a longword containing the access mode.

   The $PSLDEF macro in STARLET.MLB and the file PSLDEF.H in
   SYS$STARLET_C.TLB define the following symbols and their values
   for the four access modes:

   Value      Symbolic Name      Access Mode

   0          PSL$C_KERNEL       Kernel
   1          PSL$C_EXEC         Executive
   2          PSL$C_SUPER        Supervisor
   3          PSL$C_USER         User

   The most privileged access mode used is the access mode of the
   caller. To change the protection of any page in the specified
   range, the resultant access mode must be equal to or more
   privileged than the access mode of the owner of that page.
 

prot

   OpenVMS usage:page_protection
   type:         longword (unsigned)
   access:       read only
   mechanism:    by value
   Page protection to be assigned to the specified pages. The prot
   argument is a longword value containing the protection code. Only
   bits 0 to 3 are used; bits 4 to 31 are ignored.

   The $PRTDEF macro for MACRO-32 and the include file PRTDEF.H for
   C define the symbolic names for the protection codes.
 

return_va_64

   OpenVMS usage:address
   type:         quadword address
   access:       write only
   mechanism:    by 32- or 64-bit reference
   The lowest process virtual address of the range of pages whose
   protection was actually changed. The return_va_64 argument is
   the 32- or 64-bit virtual address of a naturally aligned quadword
   into which the service returns the virtual address.
 

return_length_64

   OpenVMS usage:byte count
   type:         quadword (unsigned)
   access:       write only
   mechanism:    by 32- or 64-bit reference
   The length of the virtual address range whose protection was
   actually changed. The return_length_64 argument is the 32- or
   64-bit virtual address of a naturally aligned quadword into which
   the service returns the length of the virtual address range in
   bytes.
 

return_prot_64

   OpenVMS usage:page_protection
   type:         longword (unsigned)
   access:       write only
   mechanism:    by 32- or 64-bit reference
   Protection previously assigned to the last page in the range.
   The return_prot_64 argument is the 32- or 64-bit virtual address
   of a naturally aligned longword into which $SETPRT_64 writes the
   protection of this page. The return_prot_64 argument is useful
   only when protection for a single page is being changed.